10G 



GENERAL PRINCIPLES OF ZOOLOGY 



n 



FIG. 69. FIG. 70. 



FIG. 69. Blind end of an annelid protonephridium with two connected soleno- 

 cytes which open with their flagellate tubes into the excretory duct (after 

 Goodrich) 



FIG. 70. Blind end of one of the finest water-vascular canals () of a Turbellarian 

 (from Lang). , nucleus; /, processes of the terminal cell; u'f, 'flame' of the terminal 

 cell; v, vacuole. 



n 



FIG. 71. FIG. 72. 



FlG. 71.- Segmental organ of an oligocha^te (from Lang), fz, ciliated funnel; 

 dis, septum; ng l , non-glandular, ng-, glandular, part of the canal; eb, terminal vesicle; 

 In, body-wall. 



FIG. 72. Scheme of a mesonephros of a vertebrate, h, nephridial tubules; 

 m, Malpighian tubules with afferent and efferent blood vessels; n, nephrostomes; 

 u, urinary duct. 



